How Do I Call 7zip From Gradle To Unsign A Jar - gradle

Question

I want to batch Unsign some jars with in gradle but I don't want to use the ant jar method as it is too slow.
Using the 7zip command line is much faster:
7z.exe d activemq-pool-5.7.0.jar META-INF/SIGFILE.*
Where SIGFILE is the name of the previous signature.
I am trying to do it in gradle like this
println "Unsigning jars"
file(unsignedFolder + "/jars").listFiles().each { File file ->
exec {
workingDir '../tools'
commandLine '7z.exe', 'd', file.absolutePath, 'META-INF/SIGFILE.*'
}
}
However, I get the error:
Starting process 'command '7z.exe''. Working directory: D:\code\project\tools Command: 7z.exe d D:\code\project\build\unsigned\jars\activemq-pool-5.7.0.jar META-INF/SIGFILE.*
:signWebstart FAILED
:signWebstart (Thread[Daemon,5,main]) completed. Took 0.109 secs.
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':unsignJars'.
> A problem occurred starting process 'command '7z.exe''

Answer 1

Thanks to this post I realised what it should be.
I am using the command line version of 7zip now - 7za. There is also a unix version at http://p7zip.sourceforge.net/ so I am packaging them both with my script and using something along the lines of the following:
import org.apache.tools.ant.taskdefs.condition.Os
task unSignJars() {
if(Os.isFamily(Os.FAMILY_WINDOWS)) {
println "*** WINDOWS "
exec {
executable "7za.exe"
args "d", "temp.jar", "META-INF/SIGN.RSA"
}
} else if(Os.isFamily(Os.FAMILY_UNIX)) {
println "*** UNIX "
exec {
executable "7za"
args "d", "temp.jar", "META-INF/SIGN.RSA"
}
} else {
println "*** NOT SUPPORTED "
}
}
This method is twice as fast as using Java nio http://thinktibits.blogspot.ca/2013/02/Delete-Files-From-ZIP-Archive-Java-Example.html which in itself is twice as fast as the ant method mention in the OP.
import java.util.*;
import java.net.URI;
import java.nio.file.Path;
import java.nio.file.*;
import java.nio.file.StandardCopyOption;
public class ZPFSDelete {
public static void main(String [] args) throws Exception {
/* Define ZIP File System Properies in HashMap */
Map<String, String> zip_properties = new HashMap<>();
/* We want to read an existing ZIP File, so we set this to False */
zip_properties.put("create", "false");
/* Specify the path to the ZIP File that you want to read as a File System */
URI zip_disk = URI.create("jar:file:/my_zip_file.zip");
/* Create ZIP file System */
try (FileSystem zipfs = FileSystems.newFileSystem(zip_disk, zip_properties)) {
/* Get the Path inside ZIP File to delete the ZIP Entry */
Path pathInZipfile = zipfs.getPath("source.sql");
System.out.println("About to delete an entry from ZIP File" + pathInZipfile.toUri() );
/* Execute Delete */
Files.delete(pathInZipfile);
System.out.println("File successfully deleted");
}
}
}
However, unix zip -d is twice as fast again but it isn't portable.